I received a feather portable and feather razors today so I shaved as fast as I could. These blades are SHARP!!! I've been alternating between red personnas and crystals and there is no comparison to the feather. I was scared shaving near my lips and throat because I'm just not used to this level of sharpness. I'll have to wait and see if I have any skin left or redness but I'm impressed so far.